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4楼的是正确的.
man execlp
The const char *arg and subsequent ellipses in the execl(), execlp(), and execle() functions can be thought of
as arg0, arg1, ..., argn. Together they describe a list of one or more pointers to null-terminated strings
that represent the argument list available to the executed program. The first argument, by convention, should
point to the filename associated with the file being executed. The list of arguments must be terminated by a
NULL pointer, and, since these are variadic functions, this pointer must be cast (char *) NULL. |
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